AB0794 CONTRIBUTION OF LABIAL SALIVARY GLAND BIOPSY: EXPERIENCE OF THE DEPARTMENT OF RHEUMATOLOGY OF THE UNIVERSITY HOSPITAL OF IBN ROCHD (ABOUT 57 CASES)

Background:Labial salivary gland biopsy (LSGB) is a histological examination indicated for the diagnostic workup of systemic diseases such as Sjogren’s syndrome, amyloidosis, or sarcoidosis.Objectives:To study the contribution of LSGB to the diagnosis of Sjogren’s syndrome, amyloidosis, and sarcoidosis.Methods:We conducted a retrospective study of LSGB histopathological reports and clinical data of patient medical records collected in the Department of Rheumatology of the University Hospital of Ibn Rochd, Casablanca, between January 2019 and June 2020. Histology assessed Chisholm and Masson’s sialadenitis score, looked for amyloidosis, and sarcoidotic granulomas.Results:A total of 57 LSGBs were performed, of which 2 were excluded from our study because of lack of clinical data. The sex-ratio M/F was 0.1, and the median age was 53 (22 – 85). The indications were subjective eyes and mouth dryness in 40% of cases, the search for sarcoidosis and amyloidosis in 23.6% of cases, the assessment of a dryness syndrome in the context of chronic inflammatory rheumatism in 18.2% of cases, isolated dryness of the mouth in 14.5% of cases, and the search for amyloidosis in the context of a known primary Sjögren syndrome in 3.6% of cases. The stages of Chisholm and Masson for sialadenitis found were: stage I at 56.6%, stage II at 24.5%, stage III at 11.3%, and stage IV at 7.5%. Among the LSGBs performed for dryness syndrome, stages III and IV were found in 18.2% of cases among subjective eyes and mouth dryness, in 12.5% of cases among isolated mouth dryness, and in 20% of cases among chronic inflammatory rheumatisms. Three cases of AA amyloidosis (5.5%) were diagnosed. No sarcoidosis granulomas were found.Conclusion:LSGB is a simple and frequent investigation. The Chisholm stage most often found in our series was stage I, followed by stages II, III, and IV respectively. This is consistent with the results of the study of Baeteman et al (1). In addition, amyloidosis was only found in our series in 5.5% of cases, also matching with the results of Baeteman et al. (4.2%). Their study showed that LSGB has a great diagnostic interest in these two pathologies, with a sensitivity of 52-75% and a specificity of 90-100% for Sjogren’s syndrome, and a sensitivity of 48-80% and a specificity of 93-100% for amyloidosis (2). LSGB remains a simple investigation test, contributing to the diagnosis of Sjogren’s syndrome, amyloidosis, and sarcoidosis.References:[1]Baeteman C, Guyot L, Bouvenot J, Chossegros C, Cheynet F, Loudot C, et al. Faut-il encore effectuer des biopsies des glandes salivaires accessoires? Revue de Stomatologie et de Chirurgie Maxillo-faciale. 2008 Jun;109(3):143–7.[2]Scardina GA, Spanó G, Carini F, Spicola M, Valenza V, Messina P, et al. Diagnostic evaluation of serial sections of labial salivary gland biopsies in Sjögren’s syndrome. Med Oral Patol Oral Cir Bucal. 1 déc 2007;12(8):E565-568.Disclosure of Interests:None declared